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Effects of stress triaxiality ratio on the heat build-up of polyamide 11 under loading

Abstract : Adiabatic heat build-up in polymers attributed to the conversion of plastic work into dissipative heat is a well known phenomenon. The temperature in the vicinity of a crack tip due to heat build-up may be exceptionally high so that it can locally reach the glass transition temperature T g , even though the ambient testing temperature is lower than T g . A significant alteration of the local material response and damage mechanisms is then induced. By simultaneous measurement of temperature during experimental tests under quasi-static loading and for a wide range of stress triaxiality ratios, a Gurson-Tvergaard-Needleman based thermo-mechanical constitutive model, integrating temperature-dependent coefficients, has been developed. Predictive capabilities of the pro- posed thermo-mechanical model to simulate the isothermal behaviour of PolyAmide 11 (PA11) have led to adiabatic simulations, to account for the heat build-up highlighted experimentally, of ductile crack extension. The model parameters were identified using experimental data obtained from PA11 samples with a given stress triaxiality ratio. Predicted evolutions given by the proposed constitutive model for other stress triaxiality ratios and geometries are found to be in good agreement with experimental data.
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Contributor : Cristian Ovalle <>
Submitted on : Friday, March 12, 2021 - 10:46:59 AM
Last modification on : Friday, March 19, 2021 - 3:12:00 AM

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C Ovalle, G. Boisot, L. Laiarinandrasana. Effects of stress triaxiality ratio on the heat build-up of polyamide 11 under loading. Mechanics of Materials, Elsevier, 2020, 145, pp.103375. ⟨10.1016/j.mechmat.2020.103375⟩. ⟨hal-03167535⟩

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